20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille 14" Diameter Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 15 3/4" x 1"

+ Product Details Size - 36"w X 12"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 26 5/8" width X 20 5/8" height

75" Width X 37

actual front end outer dimensions are approximately 16 5/8" width X 26 5/8" height

20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille 14" Diameter Actual Filter Size – 21+ Product Details Size 20" x 22" or 22" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 23. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing